Improvement in ventilators



1. PURINGTON.

ventilators.

`N0.l50,7ll, Patented May12.1874.

UNITED STATES PATENT OFFICE.

JoHN rumNeToN, or WAKEEIELD, MASSACHUSETTS.

IMPROVEMENT IN, VENTILAToRs.

- Specification forming part of Letters Patent No. 150,711, dated May 12, 1874; application filed Maman, 1874.

To all whom it may concern:

Be it known that I, JOHN PURINGTON, of Wakefield, of the county of Middlesex and State of Massachusetts, have invented a new and useful Improvement in Ventilators; and

do hereby declare the same to befully described 'nular space or opening, (l, between the two.

The duplex or double reflecting base is supported by a series of rods, d d, extending up from lthe pipe B. Immediately over the base is a number of hollow conic frustums or blinds, C C G, arranged one over the other at equal or suitable distances apart, and surmounted by a dellecting cap, D, shaped as shown, the blinds and cap being supported by a series of rods, d d', to which they are fixed, such rods being extended up from the base A, and all' being arranged as represented.

When the ventilator so made is struck by a current of wind moving horizontally, or about so, part of the current will pass into the ventlator at one side of it through the spaces between the-blinds, and, being deflected upward and striking the bottom of the cap, will be deected'downward, and will pass out through the opposite sideof the ventilator, between the blinds. The part of the current that may mpinge against the outer surface of the lower frustum of the double base, will be deflected downward, so as to induce a downward current, through the base or the annular space c,

between it and the pipe surrounded by it. The action of the wind on the ventilator will be such as to induce a current up through the pipe, and such current to be divided so that a portion of it will escape to the leeward between the blinds, and the remainder will pass to the windwardthrough the duplex base. This, in practice, has been found to take place with the ventilator arranged on either a chimney or an air-due.

I would remark that the ventilator, instead of being circular in horizontal section, may be polygonal.

ln whatever direction an external current of Y wind may impinge against the ventilator, it rarely, if ever, will failto produce an upward current in the pipe or ilue.

I do not claim three deflectin g hollow frus; turns arranged together and with a pipe and cap, as shown in the United States patent No. 82,497 to Currier, as in my ventilator the frustum or flare h is placed within the lower frustum b,wl1ercby the action ofthe air on the frustuin is productive of a different effect from what results with Gurricrs frustum; nor do I claim blinds or deilectors, pipes, and frustums arranged as shown in either of the patents 86,809, 10,232.

I claim- The combination of the dellecting cap D, the series of hollow conic frustums or blinds C, and the frustums a b h, all arranged and applied together and to the tube B, substantially as shown and described.

JOHN PURINGTON.

Witnesses:

R. H. EDDY, J. It. SNOW. 

